Ch_3_SG_020308 - BIO 105 Ch 3(Cell Structure Function...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BIO 105 Ch. 3 (Cell Structure & Function) Sunday, February 3, 2008 3.1 Cellular level of organization Cells are the smallest unit of life Exhibit all characteristics of life All cells are highly organized Many cells become specialized for complex functions Cell theory All living things are composed of cells Cells are the functional and structural units of organisms All cells are derived from previously existing cells Discovery of cells Antonie van Leeuwenhoek- invented the light microscope Robert Hooke- first observed cells in cork Schleiden and Schwann-proposed cell theory Cell size Most cells are smaller than 1 mm in diameter Surface/volume ratio determines cell size Volume increases as the cube of the radius while surface area increases by the square of the radius Therefore small cells have a greater surface/volume ratio than larger cells Nutrients from the environment must cross the surface of the cell to enter Cells must be small in order for the surface area to be adequate to supply nutrients 3.2 Eukaryotic cells Eukaryotic cells have a membrane-bound nucleus Nucleus contains genetic material All plant and animal cells are eukaryotic Plasma membrane-outer boundary of cell Phospholipid bilayer-note arrangement of hydrophilic and hydrophobic ends Embedded proteins Associated glycolipids and cholesterol Functions of the cell membrane Functions as a barrier between the cell and its environment Plays a role in regulation of transport of substances into and out of the cell Contains receptors that determine how a cell will respond to stimuli in the environment
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern